Help with Catless Header Install!

[g59tyler]

I have a 06 BMW Z4 3.0si, I installed catless headers this weekend, I expected a CEL/SES until I get a tune. However I noticed when getting on the gas hard I noticed it cuts TSC/brake/ABS lights to yellow giving me none of the three. Is this normal until I get a tune that deletes the CEL/SES for the O2 sensors? Ive tried looking around 3/1 series N52 forums but can’t find anything on the yellow brake/tsc/abs light issue I’m having. Thanks!

[3002 tii]

Originally Posted by g59tyler

I have a 06 BMW Z4 3.0si, I installed catless headers this weekend, I expected a CEL/SES until I get a tune. However I noticed when getting on the gas hard I noticed it cuts TSC/brake/ABS lights to yellow giving me none of the three. Is this normal until I get a tune that deletes the CEL/SES for the O2 sensors? Ive tried looking around 3/1 series N52 forums but can’t find anything on the yellow brake/tsc/abs light issue I’m having. Thanks!

What does that mean? You are getting dash lights from all 3 or not?

Assuming you don’t already have a tune (or courtesy of previous owner) or o2 simulators installed, the CEL will eventually come on.

Which headers did you go with?

[g59tyler]

Went with AA reps/clones - currently not bolted to the rest of my exhaust which that should be fixed tomorrow. I do already have a CEL/SES
And Im getting dash lights for all three. See the attached vid https://youtube.com/shorts/g-p3G-yNfW0?feature=share

[g59tyler]

An update on this :

Midpipe was modified and now fits to the new headers. CEL/SES light went away which was a surprise and on hard pulls the yellow tsc/abs/brake lights do not come on anymore.